Bicycle brake disc

Abstract

The invention relates to a bicycle brake disc comprising a carrier having a connection portion configured for connection to a hub of a wheel of the bicycle rotatable about a rotation axis (X) and a plurality of coupling seats, a rotor comprising a radially outer braking track and a plurality of radially inner coupling seats that at least partially axially overlap the coupling seats of the carrier to define connection areas, wherein said rotor and said carrier are joined together by mechanical joints active in said connection areas. The constraint between at least one coupling seat of the rotor and a coupling seat of the carrier in a respective connection area has a degree of translational freedom.

What is claimed is: 
     
         1 . A bicycle brake disc comprising:
 a carrier having a connection portion configured for connection to a hub of a wheel of the bicycle rotatable about a rotation axis (X) and a plurality of coupling seats;   a rotor comprising a radially outer braking track and a plurality of radially inner coupling seats that at least partially axially overlap the coupling seats of the carrier to define connection areas;   wherein the rotor and the carrier are joined together in said connection areas by fasteners; and,   at least one coupling seat of the rotor and one coupling seat of the carrier are constrained in a respective one of connection areas with a degree of translational freedom.   
     
     
         2 . The brake disc according to  claim 1 , wherein said rotor comprises at least one coupling arm that extends radially inwards from said braking track, and at least one of said coupling seats of the rotor is arranged on a free end of said at least one coupling arm. 
     
     
         3 . The brake disc according to  claim 1 , wherein a plurality of connection areas equal to approximately half of the plurality of connection areas are constrained with a degree of translational freedom. 
     
     
         4 . The brake disc according to  claim 3 , wherein connection areas among the plurality of connection areas constrained with a degree of translational freedom are alternated with connection areas lacking a degree of translational freedom. 
     
     
         5 . The brake disc according to  claim 1 , wherein in said connection area having a degree of translational freedom, one of said coupling seat of the rotor and/or said coupling seat of the carrier has a first dimension and a second dimension, wherein the first and the second dimension are respectively measured on a first reference axis and a second reference axis that lie on a first reference plane, wherein the second reference axis intersects the first reference axis at an intersection point, said first dimension is greater than the second dimension and said degree of translational freedom is directed along the first reference axis. 
     
     
         6 . The brake disc according to  claim 5 , wherein said intersection point between the first reference axis and the second reference axis defines a geometric center of the coupling seat of the rotor and/or of the coupling seat of the carrier. 
     
     
         7 . The brake disc according to  claim 5 , wherein said first reference plane is perpendicular to said rotation axis (X). 
     
     
         8 . The brake disc according to  claim 5 , wherein each coupling arm is connected to said braking track in a connection area comprised between two circumferential end points; each first reference axis passes through the respective connection area and intersects a reference segment passing through the two circumferential end points. 
     
     
         9 . The brake disc according to  claim 5 , wherein each coupling arm is circumferentially delimited by a first outer edge and a second outer edge, wherein said first reference axis is aligned with said connection area, with a direction comprised between said first and said second outer edge. 
     
     
         10 . The brake disc according to  claim 5 , wherein said second reference axis is substantially perpendicular to said first reference axis. 
     
     
         11 . The brake disc according to  claim 5 , wherein said first dimension is at least 1.5% greater than the second dimension. 
     
     
         12 . The brake disc according to  claim 5 , wherein said first reference axis forms an angle comprised in absolute value between 0 and 80° with respect to a second reference plane perpendicular to the first reference plane and containing said rotation axis (X), said angle being measured in the radially outer direction with respect to said intersection point. 
     
     
         13 . The brake disc according to  claim 5 , wherein one of said coupling seat of the rotor and/or said coupling seat of the carrier is within a reference circumference having a diameter equal to or smaller than said second dimension. 
     
     
         14 . The brake disc according to  claim 5 , wherein one of said coupling seat of the rotor and/or said coupling seat of the carrier is delimited by a first edge, a second edge and two joining edges that respectively extend between the first and the second edge, wherein the first edge symmetrically mirrors the second edge with respect to said second reference axis and wherein said two joining edges symmetrically mirror one another with respect to said first reference axis. 
     
     
         15 . The brake disc according to  claim 1 , wherein each of the connection areas has a degree of translational freedom between the coupling seat of the rotor and the coupling seat of the carrier. 
     
     
         16 . The brake disc according to  claim 2 , wherein each of the connection areas has a degree of translational freedom between the coupling seat of the rotor and the coupling seat of the carrier. 
     
     
         17 . The brake disc according to  claim 5 , wherein each of the connection areas has a degree of translational freedom between the coupling seat of the rotor and the coupling seat of the carrier. 
     
     
         18 . The brake disc according to  claim 6 , wherein each of the connection areas has a degree of translational freedom between the coupling seat of the rotor and the coupling seat of the carrier. 
     
     
         19 . The brake disc according to  claim 7 , wherein each of the connection areas has a degree of translational freedom between the coupling seat of the rotor and the coupling seat of the carrier. 
     
     
         20 . The brake disc according to  claim 11 , wherein each of the connection areas has a degree of translational freedom between the coupling seat of the rotor and the coupling seat of the carrier.